- thysanuran⇄adj. of or belonging to this order.
- thysanuran⇄noun any one of an order of wingless insects having long antennae, a scaly, flattened body that is silvery or gray in color, and two or three slender caudal appendages. Silverfishes and bristletails are thysanurans.
- thysanuran⇄thysanuran, noun, adjective.